📄 function.dirname.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Returns directory name component of path</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.delete.html">delete</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.disk-free-space.html">disk_free_space</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.dirname" class="refentry"> <div class="refnamediv"> <h1 class="refname">dirname</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">dirname</span> — <span class="dc-title">Returns directory name component of path</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><b><b>dirname</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$path</tt></span> )</div> <p class="para rdfs-comment"> Given a string containing a path to a file, this function will return the name of the directory. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">path</tt></i></span> <dd> <p class="para"> A path. </p> <p class="para"> On Windows, both slash (<i>/</i>) and backslash (<i>\</i>) are used as directory separator character. In other environments, it is the forward slash (<i>/</i>). </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the name of the directory. If there are no slashes in <i><tt class="parameter">path</tt></i>, a dot ('<i>.</i>') is returned, indicating the current directory. Otherwise, the returned string is <i><tt class="parameter">path</tt></i> with any trailing <i>/component</i> removed. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.0.0</td> <td colspan="1" rowspan="1" align="left"> <b>dirname()</b> is now binary safe </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.0.3</td> <td colspan="1" rowspan="1" align="left"> <b>dirname()</b> was fixed to be POSIX-compliant. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>dirname()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$path </span><span style="color: #007700">= </span><span style="color: #DD0000">"/etc/passwd"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$file </span><span style="color: #007700">= </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">$path</span><span style="color: #007700">); </span><span style="color: #FF8000">// $file is set to "/etc"<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Since PHP 4.3.0, you will often get a slash or a dot back from <b>dirname()</b> in situations where the older functionality would have given you the empty string. <br /> </p></blockquote> <p class="para"> Check the following change example: <div class="informalexample"> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">//before PHP 4.3.0<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/'</span><span style="color: #007700">); </span><span style="color: #FF8000">// returned '.'<br /><br />//after PHP 4.3.0<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// returns 'c:\'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/Temp/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// returns 'c:/Temp'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// returns '\'<br /><br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.basename.html" class="function" rel="rdfs-seeAlso">basename()</a></li> <li class="member"><a href="function.pathinfo.html" class="function" rel="rdfs-seeAlso">pathinfo()</a></li> <li class="member"><a href="function.realpath.html" class="function" rel="rdfs-seeAlso">realpath()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.delete.html">delete</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.disk-free-space.html">disk_free_space</a></div> <div class="up"><a href="ref.filesystem.html">Filesystem Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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